comedy network stars jon stewart and stephen colbert offer viewers alternatives. >> i asked my students in class today out of 20 students, 20 said they were going to that rally. why? because they feel that the only people on television would call politicians out if their misstatements, him okay risies, mistruths or sort of weak logic are stephen colbert and jon stewart. >> reporter: the rallies are scheduled thrust just three days before the u.s. congressional mid-term elects. seen some democratic strategists question whether the effort will keep those away who might otherwise have volunteered to get the vote out that weekend. >> what could happen is you might actually mobilize them, get them interested and get them to see what is at stake in this election. >> reporter: facebook sites for the october 30th rallies have already racked up nearly 200,000 rsvps. >> the way they're reaching folks, you mention the tv show but they are reaching these folk through social networks. >> reporter: d.c.-based sosa labs helps progressive groups organize their movements online. >> what i'm thinking and